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Sun-Mar Excel

Sun-Mar Excel

$1,845.00

Availability: 2 to 3 weeks

The best-selling self-contained composting toilet in North America.

SKU: 845

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Sun-Mar Excel Self-Contained Composting Toilet


The Sun-Mar Excel is the best-selling self-contained composting toilet in North America. It is a high-capacity Bio-drum toilet that is simple to operate, features proven technology, and is extremely reliable.

The Excel was designed to accommodate families of up to 5 (3 adults) for full-time residential use, or families of up to 8 (6 adults) for seasonal use. With normal use, the Excel can evaporate all liquids; however, a 1" emergency drain is fitted at the rear and should be connected if the toilet is expected to get continuous use. This self-contained composting toilet is fitted with a 2" vent stack attached at the top rear of the unit that can be installed invisibly by running it through the wall and up the outside wall. For comfort, the Excel has a sturdy detachable footrest that can be removed to pull out the finishing drawer.

The Excel was the first self-contained composting toilet to be certified by the National Sanitation Foundation (NSF). It was tested by the NSF at maximum capacity for 6 continuous months, during which it produced no odor and produced a clean, safe compost. Only Sun-Mar self-contained units are listed for residential and cottage use by NSF, whose Standard #41 is the toughest composting performance standard in the world. When you purchase an Excel, you are literally purchasing the composting toilet that sets the standard.

Sun-Mar Excel Self-Contained Composting Toilet Specs

  • 32" H x 22½" W x 33" D
  • 60 lbs
  • 48" D required to remove drawer
  • Residential/continuous use capacity: 3 adults or families of 5
  • Seasonal/vacation use capacity: 6 adults or families of 8
  • Vent pipe: 2" PVC thin wall
  • 1" drain hookup required for residential/continuous use
  • Fan: 35W
  • Heater: 250W

About Sun-Mar Composting Toilets

Sun-Mar Composting Toilets save more than 10,000 gallons of water per year, keep water clean for drinking and swimming by not polluting groundwater, and recycle human waste into safe, usable soil. And because their aerobic decomposition produces no sewer gases, they are odor-free! Installation directly into the bathroom is a snap because no water connection is required. Everything for installation and start up, including the vent stack, is included. Great for use in homes, cottages, weekend cabins, pool houses, barns, stables, workshops, or off-grid applications - anywhere you want to minimize your ecological footprint. Real Goods has sold thousands of Sun-Mars with almost universal satisfaction. NSF/ANSI certified. Five year parts-replacement warranty.

This product is shipped directly from the manufacturer or distributor and will arrive separately from any other products ordered. Availability estimates are based on average lead times and can vary due to stock status and location.

Returns & Replacements
Products can be returned for a refund within 30 days of receipt if unused and in original packaging. Returns are paid for by customer unless product is defective or damaged, in which case Real Goods assumes responsibility. Please use Fedex, UPS, or USPS with tracking, for returns.

Returns of solar panels, inverters or other large ticket items will incur a re-stocking fee of up to 20%. Freight shipping is non-refundable.


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